Apparatus for abrading



R. ROSCOE prmrus won mom Aug. 7, 192

Filed Oct. 7. i924 45heets-Sheet 2 Patented Aug. 7, 1928.

UNITED I STATES 1,679,376 PATENT OFFICE.-

ROIBEBT RQSCOE, OI CLARENDON HIIlI S, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OFNEW YORK, N. Y., A. CORPORATION OF NEW YORK.

APPARATUS FOR ABRADING.

' Application filed October 7, 1924. Serial 1%. 742,114.

' This invention relates to apparatus for abrading, and more particularly to an apparatus for abrading the surfaces of metal and other articles preliminary to the ap- 5 plication of a protective coating thereon.

The primary object of the present lnvention is to provide an improved apparatus for rapidly and efliciently abrading the surfaces of articles of various shapes and sizes with a v minimum amount of manual handling.

Other objects andadvantages will become apparent in the following detailed description and the novel features of the invention will be particularly pointed out in the apl pended claims. a

The preferred embodiment of the invention comprises a barrel shaped treating chamber within which one or more blast nozzles are caused to direct abrading material :0 upon the contents contained therein. A

loading tray or platform is provided whereby the articles to be treated are introduced into the treating chamber and a dump door is provided whereby the treated articles are ejected from the treating chamber and ,col-

lected in a suitable receptacle positioned nearby. Means is provided for directing a blast of air upon t e treated articles to remove the dust and pulverized blasting material from the surfaces thereof before they are ejected from the treating chamber. The dust and pulverized sand escape through an exhaust cowl or canopy which tops a cabinet inclosing the apparatus and is readily removable therefrom to permit of replacing or repairing the treating chamber.

, One embodiment lustrated in the accompanying drawings, in which 0 Fig. 1 is a front elevation, partly in section, of .a sand blast apparatus embodying the features of the present invention;

of Fig. 1; r

Fig. 3 is a vertical section on the line -3-3 of Fig. 2; r

"Fig. 4 is an enlarged detail view of one of the blast nozzles;

Fig. 5 is an enlargeddetail view of the 50 sand supply fixture;

. Fig. 6 is an enlarged detail view of the air and sand control mechanism, and 6' Fig. 7 is an enlarged fragmentary view illustrating one of the various construction of the invention is il- Fig. 2 is a vertical section on the line'2-2' Referring now to the drawings in detail, wherein like reference characters designate corresponding parts throughout the several views, 10 is a sheet steel cabinet within which are enclosed all of the operatingparts of the machine. A sand hopper comprising two conical shaped compartments 11, 11, is suitably supported near the bottom of the cabinet 10, and sand from any suitable suppl source (not shown) is introduced into each 5 of the compartments 11 through an inlet pipe 12 which is disposed at an angle of approximately 45. The bottom or; reduced portion of the compartment 11 is open and is connected with a housing or sand supply fixture 13.

Rotatably supported in the upper part of the cabinet 10 is a barrel shaped chamber 15 comprising a perforated cylindrical portion 16 and sloped end portions 17 and 18. A re- 76' movable door 19 forms a part of the cylindrical portion 16 and is provided with a suitable cam latch 20 by which it is securely locked in position. Sand blast nozzles 22 project into the chamber 15 through openings 23 in the end portions 17 and 18 there-- of. Each sand blast nozzle 22 is connected to a. chambered fixture 24 (Fig. 4), which carries therein an air nozzle 25 which exj tends a short distance into the sand blast -85. nozzle 22 to give the correct siphoning effeet. The sand supply fixture 13 is connect,- ed with the fixture 24 by a pipe 21, which at its point of connection with the sand supply 4 fixture 13 is disposed at an angle of approximately 45, and through which the sand is drawn therefrom to the sand blast nozzle 22. An air agitator nozzle 27 is located within the sand supply fixture 13 and serves to keep the sand therein in a suitable condition to be drawn and also assists in moving the sand therefrom through the pipe 21 tothe sand blast nozzle 22. An air supply 'line 29 is connected with the air nozzle 25 in the fixture 24:and with the'air agitator nozzle 27 in the sand supply fixture 13. A water separator 26 of any well known construction is provided in the air line 29 for removing the water therefrom, and a suitable pipe or con-' duit 28 is provided for draining off the water 106 removed thereby.

An air nozzle 30, independently of the nozzle 22, projects into the chamber 15 through the opening 23, and air flowing therethrough serves to remove the dust and pulverized 11o sand from the surfaces of the treated articles before they are removed from the treating chamber. A three way valve 32 is provided in the main air line 29 for. controlling the air supplied to the air nozzles and 30 and the air agitator nozzle 27. A lever 33 is provided for operating the valve 32 and resiliently supports a member 34 which is adapted to engage either of three notches 35, 36 and 37 in a segment 38 whereby the valve 2 may be locked in either of three positions,

The treating chamber 15 is supported on a pair of idler rollers 39 and a pair of friction drive rollers 40. The idler rollers 39 are keyed to an idle shaft 41 rotatably journaled in bearings 42 and the friction drive rollers are keyed to a shaft 43 rotatably journaled in bearings 44. A sprocket 45 is secured to the end of the shaft 43 and is driven by a chain 46 from a sprocket 47 secured to a main drive shaft 48. The shaft 48 may be driven from any suitable source of power such as an electric motor 49, and a gear reducer of a well known type indicated generally at 50 may be employed to operate the machine at the required speed. The sprockets 45 and 47 and the chain 46 are inilosed in a housing 51 secured to the frame To facilitate introducing articles to be treated into the chamber 15, a tray or loading platform 55 is provided which is hinged at 56 to the frame 10 so that it may be moved to the position wherein it is shown in dotted lines in Fig. 2, when the 'door 19 is removed from the chamber 15. The loading platform 55 is provided with side members 57 which serve to prevent articles from falling therefrom during the loading operation into the lower portion of the inclosing cabinet and thus interfere with the operating parts of the machine.

Suitably supported directly below the treating cham er 15 and disposed at an angle of approximately 45 is a perforated steel plate 60 which is in alignment with a dump chute 61 secured to the frame 10. A dump door 62 is hinged at 63 to the frame 10 and opens inwardly to rovide an unrestricted passage for the e ected articles between the plate 60 and chute 61. The dump.

door 62 is operated by a lever 64 positioned at the side of the cabinet 10 wlthin convenient reach of the operator. A rubber sheet 65 secured to the inner side of dump door 62 serves to prevent the escape of sand from the cabinet 10.

The cabinet 10 is topped by an exhaust cowl or canopy which is secured to the cabinet and to exhaust pipes 71 by eyebolts 72 so that it can quickly be disconnected and removed when it is necessary to replace or repair the treating chamber 15. A door 74 is provided in the front side of the cabinet 10 and is adapted to be elevated in suitable uide ways 75 to expose the treatin chamer 15 during the loading and unloa in operations. Thedoor 74 is suspende by cables threaded over pulleys 76 supported by a horizontal I-beam 77 and connected to balancing weights 78 to facilitate the opening and the closing thereof.

When loading the treating chamber 15, the door 74 is elevated in the guide ways 75 and the door 19 is removed from the chamber 15 to provide an opening therein for the insertion of the articlesto be treated. The loading platform 55 is then swung inwardly so that it rests on the lower lip of the opening in the treating chamber to permit sliding the articles therein. When the treating chamber has been loaded, the door 19 is locked in place and the door 74 is closed. The apparatus is now ready for the sand blasting operation.

Upon starting the electric motor 49 to rotate the treating chamber 15, the lever 33 is moved to the notch 35 in the segment 38 which operates the valve 32 to start the sand blasting operation &}see Fig. 6). The rotation of the barrel 5 sped treating chamber causes a rotary movement of the articles being treated and the sloped ends ofthe chamber causes a longitudinal movement thereof. After the articles have been treated the lever 33 is moved to the notch 36, at which position a current of clean air is directed against the treated articles through the nozzle 30, thereby removing the dust and pulverized sand from the surfaces thereof. The dust and pulverized sand escape through the exhaust cowl 70' and the spent sand escapes through apertures 80 in the treating chamber and re-enters the compartment 11 through a steel screen 81 covering the top opening thereof.

After the dusting operation, the valve 32 is closed and the treated articles are read to be removed from the treating cham r. The door 74 is opened the door 19 is removed, and the dump door 62 is swung inwardly to form an unrestricted passage with the steel plate 60 and the chute 61. The treating chamber is then rotated, causing the treated articles to drop throu h the openin therein, falling upon the stee plate 60 an dump door 62 and sliding down the chute 61 into any suitable receptacle positioned nearby.

What is claimed is: 1. In an abrading apparatus, a compartment, :1 treating receptacle housed by the compartment containing an article to be treated, a nozzle arranged within said comartment and extending into the receptacle or directing abrading material u on the surfaces of the article, and a secon nozzle positioned within the other nozzle'for, di-,, recting a gaseous medium upon the surfaces of :1 treated article to remove the loose material therefrom after the article has been abrladed while confined within said receptac e.

2. In an abrading apparatus, a cabinet, a. treating. receptacle enclosed by the cabinet and housing an article to be treated, a chute permanently attached tothe cabinet and movable to a position for introducing ar ticles into the treating receptacle, a nozzle A 'extendmg into the treating receptacle for directing abrading material upon the surfaces of the article, and a second nozzle material therefrom after the nozzle has been abraded.

Inflwitness whereof, I hereunto subscribe my name this 26th day of September A. D., 80

ROBERT ROSCOE. 

